Merge pull request #79 from convexengineering/fixLink

Fixing GPfit paper link.

README.md

@@ -2,7 +2,7 @@
 
 GPfit is a Python package for fitting geometric programming models to data.
 It requires installation of [GPkit](http://gpkit.readthedocs.org/en/latest/).
-This [paper](http://web.mit.edu/~whoburg/www/papers/gp_fitting.pdf)
+This [paper](http://hoburg.mit.edu/publications/gpfitting.pdf)
 describes the approach.
 
 [![Build Status](https://acdl.mit.edu/csi/buildStatus/icon?job=gpfit_Push)](https://acdl.mit.edu/csi/job/gpfit_Push/)